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2 article(s) from Takaki, Ken

Three-component coupling of aryl iodides, allenes, and aldehydes catalyzed by a Co/Cr-hybrid catalyst

Kimihiro Komeyama,
Shunsuke Sakiyama,
Kento Iwashita,
Itaru Osaka and
Ken Takaki

Beilstein J. Org. Chem. 2018, 14, 1413–1420, doi:10.3762/bjoc.14.118

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Scheme 1: Nucleophilic and π-electrophilic characters of organometallics depending on the central metals.

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Scheme 2: Ni/Cr or Co/Cr-catalyzed NHK reaction.

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Scheme 3: Functionalization of alkynes via carbocobaltation.

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Scheme 4: Cyclization/borylation of alkynyl iodoarenes using the Co/Cr catalyst.

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Scheme 5: Three-component coupling of aryl iodides, arenes, and aldehydes using Co/Cr catalyst (this work).

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Scheme 6: Screening of aldehydes in the Co/Cr-catalyzed three-component coupling reaction. All yields are det...

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Scheme 7: Screening of aryl iodides in the Co/Cr-catalyzed three-component coupling reaction. All yields are ...

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Scheme 8: Screening of allenes in the Co/Cr-catalyzed three-component coupling reaction. All yields are deter...

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Scheme 9: Reversed diastereoselectivity using allenyl ethers 5 and 6. ^a4-chlorobenzaldehyde was used instead ...

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Scheme 10: Stoichiometric reaction of phenylchromium(II or III) reagents (reaction 1) and the three-component ...

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Scheme 11: The origin of the diastereoselectivity in the present three-component coupling.

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Scheme 12: Plausible reaction mechanism of the three-component coupling.

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Published 11 Jun 2018

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NHC-catalyzed cleavage of vicinal diketones and triketones followed by insertion of enones and ynones

Ken Takaki,
Makoto Hino,
Akira Ohno,
Kimihiro Komeyama,
Hiroto Yoshida and
Hiroshi Fukuoka

Beilstein J. Org. Chem. 2017, 13, 1816–1822, doi:10.3762/bjoc.13.176

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Scheme 1: Reaction process.

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Figure 1: ORTEP drawing of Z-4ai.

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Scheme 2: Reaction mechanism.

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Scheme 3: Isomerization of the stereochemistry of 4ai.

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Scheme 4: Reaction of cycloalkane-1,2-diones with phenyl vinyl ketone (6a).

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Scheme 5: Preparation and reactivity of the bisacylated Breslow intermediate 10.

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Figure 2: ORTEP drawing of 10.

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Scheme 6: Preparation of the iminium salt 12 and its reactivity.

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Scheme 7: Resting state of the monoacylated Breslow intermediate C.

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Published 30 Aug 2017

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